Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/38471
Título
Resonant van-der-Waals Interaction: net harmonic force on a two-atom system
Autor
Director o Tutor
Año del Documento
2019
Titulación
Máster en Física
Zusammenfassung
We perform a time-dependent quantum computation of the van der Waals interaction between two free identical atoms, one of which is initially excited. Making use of the perturbative
approach developed in Refs. It is shown that, in addition to an off-resonant interaction force
between the two atoms, the two-atom system is subjected to a net force which oscillates
periodically in time. We prove that the apparently missing momentum is carried by the resonant
photons which mediate the periodic transfer of the excitation between the atoms, guaranteeing this
way the satisfaction of the action-reaction principle in the quantum realm. Remarkably, since
mediating photons remain virtual throughout the process, their momentum is virtual and thus
unaccessible experimentally. Ultimately, as the de-excitation of the system takes place, that
momentum turns into actual when carried off by the real photon which is emitted spontaneously.
Hence, the directionality of such an emission constitutes a vestige of the net force acting upon
the two-atom system while excited.
Palabras Clave
Quantum optics
Quantum electrodynamics
Van der Waals forces
Departamento
Departamento de Física Teórica, Atómica y Óptica
Idioma
eng
Derechos
embargoedAccess
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